Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect connector HV2 from the PCB

Measurement:

Test 1:
Measure resistance across Pin 8 (Blue) and
Pin 9 (Orange) on HV2
Expect resistance of 770 Ohms (±10%).
Test 2:
Measure resistance between each wire -
Pin 8 (Blue) and Pin 9 Orange, and a suitable earth point.
Expect resistance greater than 1M Ohm on each wire.